APA (7th ed.) Citation

Vaughan, S., Pounds, K. A., Reeves, J., Warwick, R., & Edelson, R. (1999). Evidence for an ionized disc in the narrow-line Seyfert 1 galaxy Ark 564. Monthly Notices of the Royal Astronomical Society, 308(4), L34. https://doi.org/10.1046/j.1365-8711.1999.03013.x

Chicago Style (17th ed.) Citation

Vaughan, S., K. A. Pounds, J. Reeves, R. Warwick, and R. Edelson. "Evidence for an Ionized Disc in the Narrow-line Seyfert 1 Galaxy Ark 564." Monthly Notices of the Royal Astronomical Society 308, no. 4 (1999): L34. https://doi.org/10.1046/j.1365-8711.1999.03013.x.

MLA (9th ed.) Citation

Vaughan, S., et al. "Evidence for an Ionized Disc in the Narrow-line Seyfert 1 Galaxy Ark 564." Monthly Notices of the Royal Astronomical Society, vol. 308, no. 4, 1999, p. L34, https://doi.org/10.1046/j.1365-8711.1999.03013.x.